John H. Gerstner
Before he wrote his massive Rational Biblical Theology of Jonathan Edwards, Gerstner wrote this introduction to the theology of Edwards. There are eleven chapters on such topics as Reason and Revelation, The Trinity, Man and His Fall, Sin, The Atonement, Justification, Sanctification, and several others. If you are not ready to tackle the large three-volume set, this would be a great place to start. If you simply want an introduction and overview of Edwards' theology, this is exactly what you've been looking for.